Extend usage for OF_OVERLAY_LIST beyond SPL

Allow to use OF_OVERLAY_LIST also for the case that the overlays just
need be built, e.g. when they will be picked up by binman as artifacts
of the final U-Boot image. The IOT2050 boards have such a need when
switching to OF_UPSTREAM.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Reviewed-by: Sumit Garg <sumit.garg@linaro.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/dts/Kconfig b/dts/Kconfig
index 569d4be..7ea4fd5 100644
--- a/dts/Kconfig
+++ b/dts/Kconfig
@@ -226,11 +226,11 @@
 
 config OF_OVERLAY_LIST
 	string "List of device tree overlays to include for DT control"
-	depends on SPL_LOAD_FIT_APPLY_OVERLAY
 	help
 	  This option specifies a list of device tree overlays to use for DT
 	  control. This option can then be used by a FIT generator to include
-	  the overlays in the FIT image.
+	  the overlays in the FIT image or by binman when assembling an image
+	  that uses overlays during DT fixup.
 
 choice
 	prompt "OF LIST compression"